Fwd: [PATCH] Fix PR56915

[Shixiong Xu]

This patch is for the ICE of PR56915
(http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56915), specific to gcc
4.9. Because this patch only touches the C++ frontend, I only ran the
g++ and libstdc++ testsuits with the newly added testcase. And the
test results on Ubuntu x86_64 indicate no regression regarding the
testsuits.

The problem causing the ICE is that GCC sets DECL_INTERFACE_KNOWN too
early before 'start_preparsed_function', which generates the body of
the thunk and depends on the value of DECL_INTERFACE_KNOWN. Moving the
setting after the point of 'start_preparsed_function' or
'symtab_add_to_same_comdat_group' fixes the problem.

Shixiong

commit 1bc89baae77d7a6d4f98b70e6e603454e2837919
Author: Shixiong Xu <shixi...@kugelworks.com>
Date:   Sun Apr 28 22:11:05 2013 +1200

        PR c++/56915
        * gcc/cp/semantics.c: Move down the setting to 
DECL_INTERFACE_KNOWN(...) after symtab_add_to_same_comdat_group(...).
        * gcc/testsuite/g++.dg/torture/pr56915.C: New.

pr56915.patch
Description: Binary data